Fehlerhafter Zahlvorgang: "Kauf wird nicht unterstützt" bei Upgrade auf gesamte Cloud

you can get more info from adobe support, if you're not sure why you don't qualify.  there are 2 ways to contact adobe; chat and twitter (now x):

chat:
use a browser that allows popups and cookies
and click here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human.

twitter/x:
tweet @AdobeCare

p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative.

Black Friday deals are only for NEW subscribers

If you qualify, you should be able to buy an Education subscription

Start at http://www.adobe.com/education.html-https://www.adobe.com/offer-terms/student_teacher_eligibility.html-Cloud

Education Plan https://creative.adobe.com/plans?plan=edu-http://www.adobe.com/creativecloud/buy/students.html

FAQ https://helpx.adobe.com/x-productkb/policy-pricing/education-faq.html
-One Year Intro Price https://community.adobe.com/t5/account-payment-plan-discussions/why-is-my-account-now-31-a-month-and-not-the-20/td-p/8862330-Redemption
Code https://creative.adobe.com/educard